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First access to any table is very slow.
This problem may come from the fact that the BDE must query the DB to get table information before working with the table the first time. Once it has the information, it is able to cache it and will work quickly throughout the remainder of the session (while TDatabase.Connection remains True). To use the cached information between runs, go to the BDE config program to the particular alias you are using to connect through and set BDE CACHE = TRUE and BDE CACHE DIR = 'C:\temp' or wherever you want the files to be stored.
Note: Be aware that if you change your table definition, you will need to delete the file in this Cache dir that represents it. You can find the filename in the SCache.INI file located in the same directory by viewing it in your favorite text editor.
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